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Reproductive Biology of Common Silver Biddy, Gerres Filamentosus (Cuvier)

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Reproductive Biology of Common Silver Biddy, Gerres Filamentosus (Cuvier) Available online a t www.pelagiaresearchlibrary.com Pelagia Research Library Advances in Applied Science Research, 2014, 5(4):144-152 ISSN: 0976-8610 CODEN (USA): AASRFC Reproductive biology of common silver Biddy, Gerres filamentosus (Cuvier) Nikitha Divakaran and Kuttyamma V. J. Department of Marine Biology, Microbiology, and Biochemistry , Cochin university of Science and Technology, Kerala, India _____________________________________________________________________________________________ ABSTRACT Common silver biddy Gerresfilamentosus were collected monthly between November 2002 and November 2005 fromFort Kochiof Kerala. The seasonal reproductive cycle of this species was investigated using histological observation of gonads. On the basis of morphological and histological changes, which the ovaries undergo during maturation, five stages of maturity are identified such as immature, maturing and recovering spent, mature, ripe and spent. From the histological study of Oogenesis, a number of distinct developmental stages were delineated in G.filamentosus, viz. the oogonia,Chromatin nucleolus stage, Early and Late Perinucleolusstages,Lipid droplet stage, Cortical alveoli(Yolk vesicle) stage,Yolk granule stage and Mature oocytes. Keywords : Gerresfilamentosus , Fort kochi, Histology, Ovary, Oogenesis _____________________________________________________________________________________________ INTRODUCTION In the endeavour of rational exploitation of fishery resources through the application of biological principles and intensive aquaculture of fishes through selective breeding, brood stock development, domestication and genetic improvement, studies on reproductive biology of fishes have attracted considerable attention.In the study of the biology of fish, maturation process of gonads forms an important aspect as it leads to theunderstanding of the reproductive characteristics and breeding behaviour of the fish. With advances made in the histological and cytological methods, the process of oogenesis and spermatogenesis have been studied in greater detail in recent years. The success or failure of a species in any environment largely depends on its spawning potential. To overcome the various physical and biological hazards in the environment and to attain successful recruitment, fishes have a high reproductive potential. Information on the various aspects of reproductive mechanism and breeding biology of fishes is therefore an essential pre-requisite for the successful management of both capture and culture fisheries.In view of the paucity of works on the histological and cytological studies on gonad development of Indian marine teleosts in general and Gerrids in particular, the present investigation on Gerresfilanientosus was carried out. The reproductive biology of Gerrids of Indian waters have been reported by several workers (Jones and Sujansingani, 1954; Jhingran, 1957; PrabhakaraRao 1970, Patnaik,1971, Kurup and Samuel 1984, Sivashanthini and Ajmal Khan, 2004). The histological studies of G.filamentosus is still unknown. Little information is available on the reproductive cycles of Gerridae although Austin (1971) and Etchevers (1978) studied the breeding of Diapterusrhombeus in the offshore waters of Puerto Rico and Venezuela; Charles (1975) investigated the reproductive cycle of Eucinostomusgula in Biscayne Bay, Florida, U.S.A. 144 Pelagia Research Library Nikitha Divakaran and Kuttyamma V. J. Adv. Appl. Sci. Res., 2014, 5(4):144-152 _____________________________________________________________________________ MATERIALS AND METHODS The fishes for the study were collected using different types of fishing gears like gill nets, seines and cast nets from Fort Kochi(Fig.1). Fig.1 Map showing the collection site Microscopic examination of the gonad is essential since the sex can be identified macroscopically except for the ripe male and female fishes. The fishes were bought to the laboratory in fresh condition and the total length, standardlength, and weight of each individual fish were noted. For histological studies portions of the anterior, middle and posterior regions of the gonads dissected out, from the freshly killed specimens were fixed in Bouin's fixative.The tissues were then transferred through graded alcohols (70-95 % [v/v] before final dehydration in absolute ethanol. The alcohol contained in the tissues were next eliminated by immersing them in xylene. The tissues were then impregnated with paraffin, which is soluble in xylene, at 60 0C and embedded in paraffin. After processing, 5µm sections were stained using Haematoxylin-eosin staining procedure. RESULTS 3.1 Gonad Development Gonads of inactive and immature specimens are thin, transparent tubes, but those of mature and ripe individuals occupy most of the abdominal cavity. Ripe ovaries are the shape of thick, stubby cigars and ripe testes rather flattened with irregularly shaped margins. In males and females both left and right gonads develop and are active throughout gonad development. 3.2 Classification of gonads or quantification of maturity stages Based on the colour, size , shape and microscopic observation, teleost gonad can be classified into different maturity stages to quantify gonadal maturation. Different workers have adopted various maturity schemes to classify gonads. The most common one is a five-point maturity scale, ideal for most of the tropical total spawners as developed by Qasim. More or less similar to the scheme given for Blenniuspholis L. and Centronotusgunnnellusgun (L) (Qasim 1957 a and b), five stages of maturity were drawn on the basis of the general appearance of gonads (Table. 1). 3.2.1 Histology of the ovary Early in development, longitudinal ridges arise on the ventrolateral surface of the developing ovaries, and fuse to enclose a cavity which is purely coelomic and is lined by the peritoneal epithelium, unlike the ovarian cavities of other vertebrates, which are lined by mesenchyme. 3.2.3 Ovarian histology of Gerresfilamentosus 1) Immature virgins :- Oocyte in protoplasmic growth stage, no oocytes beyond a perinucleolar stage of development, Oogonial nests are visible in the epithelium of ovarian lamellae which are strongly basophilic. Ovarian wall thin. 2) Maturing virgins or Recovering spents :- Chromatin nucleolus stage and early perinucleoli stages appear. Larger oocytes with granular cytoplasm and yolk nucleus. Ovarian wall thickens. Basophilia decreases. 3) Maturing/ Ripening :- Oocytes continue to increase in size. Late perinucleolus stage oocytes with less basophilic cytoplasm visible. Endogenous yolk vesicles appear along the periphery of larger oocytes and may reach half way to the nucleus. 145 Pelagia Research Library Nikitha Divakaran and Kuttyamma V. J. Adv. Appl. Sci. Res., 2014, 5(4):144-152 _____________________________________________________________________________ 4) Ripe :- Yolk vesicles of stage VI oocytes coalesce and become larger in size. Follicular layer of these oocytes becomes clearly visible. Exogenous yolk accumulates and yolk granules appear. , 5) Spent :- Numerous post ovulatory follicles are present, residual hydrated oocytes may also be present. Oocytes of Gerresfilamentosus followed, the general pattern of development and histology found in other teleosts. Oocyte development and reproductive strategy have been described in many marine teleost species in an effort to understand the time course and energetic consequences of reproductive effort. Table.1: STAGES OF GONADAL MATURITY FEMALES MALES STAGE I IMMATURE VIRGINS ' IMMATURE VIRGINS The ovaries appear as two pinkish Testes pinkish and translucent, Tesets very small 0.3 translucent jelly like structures united at the posterior end; ovaries very small, to 0.5cm in length elongated and cylindrical, rather oblong in shape; entire gonad occupies 1/4 of the body cavity of fish; Oocytes under magnification appear irregular; transparent and with a centralnucleus. STAGE II MATURING VIRGINS OR MATURING VIRGINS OR RECOVERING SPENTS RECOVERING SPENTS Ovaries slightly enlarged occupying more than one-third of the body cavity. At this stage each ovarian lobe becomes cylindrical and appears dull reddish. The two lobes Testes pinkish and opaque, still will be unequal in size, the right lobe is longer than left. It occupies almost 1/2 of the small, Slightly distended but not soft body cavity. Under microscope, central portion of the eggs appear darker. STAGES III MATURIG OR RIPENING MATURIG OR RIPENING Ovaries enlarged and occupaying ¾ th or more of the body cavity, pinkish yellow in Testics whitish outer nargin slightly irregular, testis colour. Ovarian will becomes thin, ova round, opaque and appear as dark bodies under extending 3/4 th oft the body cavity microscopes STAGE II RIPE RIPE Ovaries very much enlarged, massive ovarian lobes, fully packed with the ripe eggs, Testis extending the full length of the occupying the whole of the body cavity, with numerous blood vessels ramifying over body cavity, very soft and creamy their surface, Yellow and opaque. Some ova visible to the exterior at the vent region. white, outer margin irregular with wrinkles STAGE V SPENT SPENT Highly shrunken flesh colored and collapsed ovaries occupaying almost ½ of the body Testis extending nearly cavity. It appears blood-shot, flaccid and loosely packed with primary oocytes. Blood ½ of the bodycavity, dull white and vessels seen on surface. Often some residual eggs are available in the ovarian sac shrunken 3.3 Main stages of oogenesis of Gerresfilamentosus. Stage I: Oogonia
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